import glob, os, shutil

def printList(lst):
    for l in lst:
        print(l)

srcDir = "/home/misistik/srcDir"
destDir = "/home/misistik/destDir"
extention = "*.bin"

for file in glob.iglob(os.path.join(destDir, '*.*')):
    os.remove(file)

files = glob.iglob(os.path.join(srcDir, extention))

for file in files:
    if os.path.isfile(file):
        print(shutil.copy(file, destDir))